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      java中文件的上传下载
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        <h2 id="上传代码"><a href="#上传代码" class="headerlink" title="上传代码"></a>上传代码</h2><a id="more"></a>
<h2 id="下载代码"><a href="#下载代码" class="headerlink" title="下载代码"></a>下载代码</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"> public static void downAttachmentFile(String attachPK, HttpServletResponse response, HttpServletRequest request)</span><br><span class="line">    throws Exception</span><br><span class="line">  &#123;</span><br><span class="line">    AttachmentService attachmentService = (AttachmentService)FrameBeanFactory.getBean(&quot;attachmentServiceImpl&quot;);</span><br><span class="line">    Attachment attachment = (Attachment)attachmentService.get(attachPK);</span><br><span class="line">    String filePath = (attachment.getPath().replaceAll(&quot;\\$\\&#123;rootPath&#125;&quot;, Constants.ROOTPATH) + File.separator + attachment.getFileName()).replace(&quot;/&quot;, File.separator);</span><br><span class="line">    File file = new File(filePath);</span><br><span class="line"></span><br><span class="line">    FileInputStream in = null;</span><br><span class="line">    try &#123;</span><br><span class="line">      in = new FileInputStream(file);</span><br><span class="line">    &#125; catch (FileNotFoundException e) &#123;</span><br><span class="line">      e.printStackTrace();</span><br><span class="line">      throw new Exception(((FrameMessageResource)FrameBeanFactory.getBean(&quot;frameMessageResource&quot;)).getMessage(&quot;srplatform.auth.attachment.file_is_not_exit&quot;));</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    byte[] content = new byte[(int)file.length()];</span><br><span class="line">    int readLen = in.read(content);</span><br><span class="line">    in.close();</span><br><span class="line"></span><br><span class="line">    response.setContentType(&quot;application/octet-stream&quot;);</span><br><span class="line">//    response.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=&quot; + new String(attachment.getViewName().getBytes(request.getHeader(&quot;User-Agent&quot;).toUpperCase().indexOf(&quot;MSIE&quot;) &gt; 0 ? &quot;gbk&quot; : &quot;utf-8&quot;), &quot;ISO8859-1&quot;));</span><br><span class="line">    response.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=&quot; + new String(attachment.getViewName().getBytes(&quot;gbk&quot; ), &quot;ISO8859-1&quot;));</span><br><span class="line">    response.addIntHeader(&quot;Content-Length&quot;, readLen);</span><br><span class="line">    try</span><br><span class="line">    &#123;</span><br><span class="line">      response.getOutputStream().write(content);</span><br><span class="line">    &#125; catch (Exception e) &#123;</span><br><span class="line">    &#125;</span><br><span class="line">    response.getOutputStream().close();</span><br><span class="line">  &#125;</span><br></pre></td></tr></table></figure>
<p>附件封装成了一个对象，和数据库表对应;</p>
<ul>
<li>首先获取文件的路径</li>
<li>然后用对应的路径创建文件</li>
<li>用文件转换成文件输入流 FileInputStream</li>
<li>用文件输入流转成 字节数组 content</li>
<li>再用文件输出流write写出去</li>
</ul>
<p>response是设置文件的输出格式:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"> response.setContentType(&quot;application/octet-stream&quot;);</span><br><span class="line">//    response.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=&quot; + new String(attachment.getViewName().getBytes(request.getHeader(&quot;User-Agent&quot;).toUpperCase().indexOf(&quot;MSIE&quot;) &gt; 0 ? &quot;gbk&quot; : &quot;utf-8&quot;), &quot;ISO8859-1&quot;));</span><br><span class="line">    response.setHeader(&quot;Content-Disposition&quot;, &quot;attachment;filename=&quot; + new String(attachment.getViewName().getBytes(&quot;gbk&quot; ), &quot;ISO8859-1&quot;));</span><br><span class="line">    response.addIntHeader(&quot;Content-Length&quot;, readLen);</span><br></pre></td></tr></table></figure>

      
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